vb.net barcode generator Collins, Daniel. Carrier Grade Voice over IP. New York: McGraw Hill, 2000, pp. 167 168. in Software

Maker QR Code in Software Collins, Daniel. Carrier Grade Voice over IP. New York: McGraw Hill, 2000, pp. 167 168.

Collins, Daniel. Carrier Grade Voice over IP. New York: McGraw Hill, 2000, pp. 167 168.
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Downloaded from Digital Engineering Library @ McGraw-Hill (www.digitalengineeringlibrary.com) Copyright 2004 The McGraw-Hill Companies. All rights reserved. Any use is subject to the Terms of Use as given at the website.
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Location Servers Location servers are not SIP entities but are an important part of SIP architecture. A location server stores and returns possible locations for users. It can make use of information from registrars or from other databases. Most registrars upload location updates to a location server upon receipt. SIP is not used between location servers and SIP servers. Some location servers use the Lightweight Directory Access Protocol (LDAP, see IETF RFC 1777) to communicate with SIP servers.4
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New standards efforts are aimed toward using the IP network for nonvoice interactions. Here are a few of the more exciting standards developments:
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PSTN to Internet Interworking (PINT) The PINT (RFC 2848) standards effort defines click-to-dial services interworking between a web page and a PSTN gateway element, or PINT server. PINT is helping to standardize service delivery, including request to call, request to fax, request to hear content, and, in the future, request to conference. Services in the PSTN/IN Requesting Internet Services (SPIRITS) This working group is providing a framework for standardizing the mechanisms for controlling critical call altering and call-completion processes from the Internet by exposing the Internet domain to the PSTN s call model. The goal is to create a framework for Internet callwaiting-type services that will be applicable to wireline, wireless, and broadband (cable and x-Type Digital Subscriber Line [xDSL]) environments. Proposed SPIRITS-enabled network events include voice mail arrival, incoming call notification, attempts to dial numbers, dropping dialed connection, completing Internet service provider (ISP) connections, attempts to forward calls, and attempts to subscribe/unsubscribe to a PSTN service. Signaling Translation (SIGTRAN) The IETF standard that deals with Signaling System 7 (SS7; specifically Transaction Capabilities Application Part or TCAP over IP). A later chapter will cover SIGTRAN in greater detail. Telephone Number Mapping (ENUM) The IETF standard that defines address mapping among phone numbers and Internet devices.
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Ibid., p.105.
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Downloaded from Digital Engineering Library @ McGraw-Hill (www.digitalengineeringlibrary.com) Copyright 2004 The McGraw-Hill Companies. All rights reserved. Any use is subject to the Terms of Use as given at the website.
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SIP: Alternative Softswitch Architecture
SIP: Alternative Softswitch Architecture
It provides a way to reach multiple communication services via a single phone number. ENUM provides a process for converting a phone number into a DNS address (URL). It translates e.164 telephone numbers into Internet addresses.5
Telephony Routing over IP (TRIP) TRIP is a policy-driven interadministrative domain protocol for advertising the reachability of telephony destinations between location servers and for advertising attributes of the routes to those destinations. TRIP s operation is independent of any signaling protocol; hence, TRIP can serve as the telephony routing protocol for any signaling protocol.6
Some SIP Configurations
SIP, given its simplicity and flexibility (discussed later in this chapter), simplifies the establishment of an alternative voice network. Figure 5-4 suggests a number of applications for SIP. The figure illustrates a corporate voice network that utilizes its corporate WAN to transport its interoffice voice traffic. This company can protect their investment in legacy phones and PBXs by installing an SIP gateway to interface the TDM technology with the SIP-based VoIP network. The SIP gateways also provide an interface with the PSTN. In new offices and for remote workers, SIP phones provide a simple means of eliminating long-distance charges and connecting those workers to the rest of the network. Failing an expensive SIP phone, PC-based UAs such as those contained in Microsoft s XP (see the end of this chapter) can also function as a telephony agent connecting the worker to the network. Providing the intelligence for this network is the SIP proxy server to control the calls. The application server provides critical corporate voice services such as voice mail, follow me, conferencing, call forwarding, unified messaging, voice-activated services, web-based provisioning, and new features that can be custom developed by the corporation, the SIP equipment vendor, or third-party vendors.
Wolter, Charlotte. ENUM Brings VoIP into Telephone Mainstream. Sounding Board Magazine, June 2001, p.12 6 Interworking Switched Circuit and Voice-over-IP Networks. A white paper by Performance Technologies and the International Engineering Consortium, available online at http://www.iec.org/online/tutorials/ip_in/topic05.html, pp. 5 6.
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